BY T. STEPHENS. 767 



between the rocks in which they occur and some of the forma- 

 tions in other parts of Tasmania which are provisionally classified 

 as Upper Silurian, Lower Silurian or Ordovician, and Upper 

 Cambrian. In the absence of any positive evidence, this is as 

 far as any speculation on the subject can go. Nothing short of 

 a systematic geological survey of the whole coast could deter- 

 mine even the stratigraphical relations of the rocks which 

 have been described, nor could they be correlated with other 

 geological formations in the Commonwealth of Australia, or 

 elsewhere, without an exhaustive and successful search for the 

 fossil evidence which is undoubtedly contained in some of them. 

 It is in the hope of giving some stimulus to exploration and 

 research with this object in view that the present paper has been 

 written. 



EXPLANATION OF PLATES XXIV. -XXX. 



Plate xxiv. 

 Fig. 1.— Mersey Bluff. 

 Fig.2. — Goat Island, looking south. 



Plate xxv. 

 Fig.l. — Blackman's Point, Burnie. 

 Fig.2.— Kocky Cape East, looking north-east. 



Plate xxvi. 

 Fig.l. — Freestone Bluff and continuation of Tertiary beds capped by basalt 



on the left; Table Cape on the right; in the foreground glacial 



drift. 

 Fig.2.— Near Crayfish Creek, looking east. 



Plate xxvii. 

 Fig.l. — Rocky Cape North, looking east-south-east. 

 Fig.2. — Circular Head, with basalt in the foreground. 



Plate xxviii. 

 Geological Sketch Map of the North Coast of Tasmania from the River 

 Tamar to Circular Head, and Longitudinal Section of same along the line 

 marked on the Map. Reduced from a horizontal scale of one mile to one 

 inch. 



